Miracle Heat HR-6 Heat Reclaimer, 6"Highlights: Pipe Diameter: 6" Standards: UL Listed Usage: For Bringing an Extra 10% of the Heat Loss Back Into the Room from the Chimney Attaches to stove pipe and reclaims heat normally lost up the flue Whisper quiet, safety tested UL fan motor gently blows warm air into the room Thermostatically controlled, turns on at 160 deg F, off at 130 deg F Decorative nickel trim Install 15 24 in away from stove Not for use with oil and gas furnaces Compatible